Rear shell for a brake booster



FIG. 1 is a rear perspective of a rear shell for a brake booster showing our new design;

FIG. 2 is a rear elevation view thereof;

FIG. 3 is a side elevation view thereof;

FIG. 4 is a right side elevation view thereof; and,

FIG. 5 is a front perspective view thereof. 

The ornamental design for a rear shell for a brake booster, as shown. 